Ta/NiFe/Ta ultrathin films with and without nano-oxide layers （NOLs） were prepared by magnetron sputtering followed by a vacuum annealing process. The influence of NOLs on the magnetoresistance （MR） ratio of ultra...Ta/NiFe/Ta ultrathin films with and without nano-oxide layers （NOLs） were prepared by magnetron sputtering followed by a vacuum annealing process. The influence of NOLs on the magnetoresistance （MR） ratio of ultrathin permalloy films was studied. The results show that the influence of grain size and textures on the MR ratio becomes weak when the thickness of the NiFe layer is below 15 nm. A higher MR ratio was observed for the thinner （〈 15 nm） NiFe film with NOLs. The MR ratio of a 10 nm NiFe film can be remarkably enhanced by NOLs. The enhanced MR ratio for these ultrathin films can be attributed to the enhanced specular reflection of conduction electrons.展开更多
<span style="font-family:Verdana;">The use of wood has been considered for a long time and to this day, it has a special place in human life. Modification of wood and lignocellulosic materials is done ...<span style="font-family:Verdana;">The use of wood has been considered for a long time and to this day, it has a special place in human life. Modification of wood and lignocellulosic materials is done by various methods, including modification of physical, mechanical, chemical and thermal, that as a new technology, it leads to the improvement of their undesirable features. Among these methods, heat correction is a useful method to improve dimensional stability and leads to increased resistance to water absorption and decay. The main purpose of this study is to investigate the titanium Nano oxide and heat treatment on the physical properties of hornbeam species. Samples were saturated with titanium Nano oxide solution at a concentration of 5000 ppm and pressurized 7 times in a pressure tank. The samples were divided into three groups: control, heat and Nano thermal treatment. Heat and saturated samples with titanium Nano oxide were heat treated at three temperature levels of 150</span><span style="font-family:""><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;">, 175</span><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;"> and 200</span><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;"> for 4 and 6 hours. All three groups underwent physical tests. Heat and Nano thermal oxide treatments led to reduced water absorption and thickness swelling. Comparison between heat and Nano thermal treatment showed a further decrease in water absorption and thickness swelling in Nano thermal samples.展开更多
采用溶胶-凝胶法制备的铁钴钡氧化物纳米颗粒作为非均相类芬顿催化剂,研究其催化降解亚甲基蓝,考察催化剂投加量,H_2O_2投加量,温度等对亚甲基蓝降解效率和降解速率的影响。结果表明,在最佳的实验条件下该氧化物颗粒与过氧化氢组成的芬...采用溶胶-凝胶法制备的铁钴钡氧化物纳米颗粒作为非均相类芬顿催化剂,研究其催化降解亚甲基蓝,考察催化剂投加量,H_2O_2投加量,温度等对亚甲基蓝降解效率和降解速率的影响。结果表明,在最佳的实验条件下该氧化物颗粒与过氧化氢组成的芬顿试剂在20 min内,亚甲基蓝降解率达到95%。该反应符合一级动力学模型,55℃条件下,速率常数为0.10 min^(-1),反应活化能为54.1 k J/mol。展开更多
基金supported by the National Science Foundation of China (Nos.50671008,50871014,and 50831002)
文摘Ta/NiFe/Ta ultrathin films with and without nano-oxide layers （NOLs） were prepared by magnetron sputtering followed by a vacuum annealing process. The influence of NOLs on the magnetoresistance （MR） ratio of ultrathin permalloy films was studied. The results show that the influence of grain size and textures on the MR ratio becomes weak when the thickness of the NiFe layer is below 15 nm. A higher MR ratio was observed for the thinner （〈 15 nm） NiFe film with NOLs. The MR ratio of a 10 nm NiFe film can be remarkably enhanced by NOLs. The enhanced MR ratio for these ultrathin films can be attributed to the enhanced specular reflection of conduction electrons.
文摘<span style="font-family:Verdana;">The use of wood has been considered for a long time and to this day, it has a special place in human life. Modification of wood and lignocellulosic materials is done by various methods, including modification of physical, mechanical, chemical and thermal, that as a new technology, it leads to the improvement of their undesirable features. Among these methods, heat correction is a useful method to improve dimensional stability and leads to increased resistance to water absorption and decay. The main purpose of this study is to investigate the titanium Nano oxide and heat treatment on the physical properties of hornbeam species. Samples were saturated with titanium Nano oxide solution at a concentration of 5000 ppm and pressurized 7 times in a pressure tank. The samples were divided into three groups: control, heat and Nano thermal treatment. Heat and saturated samples with titanium Nano oxide were heat treated at three temperature levels of 150</span><span style="font-family:""><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;">, 175</span><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;"> and 200</span><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;"> for 4 and 6 hours. All three groups underwent physical tests. Heat and Nano thermal oxide treatments led to reduced water absorption and thickness swelling. Comparison between heat and Nano thermal treatment showed a further decrease in water absorption and thickness swelling in Nano thermal samples.
文摘采用溶胶-凝胶法制备的铁钴钡氧化物纳米颗粒作为非均相类芬顿催化剂,研究其催化降解亚甲基蓝,考察催化剂投加量,H_2O_2投加量,温度等对亚甲基蓝降解效率和降解速率的影响。结果表明,在最佳的实验条件下该氧化物颗粒与过氧化氢组成的芬顿试剂在20 min内,亚甲基蓝降解率达到95%。该反应符合一级动力学模型,55℃条件下,速率常数为0.10 min^(-1),反应活化能为54.1 k J/mol。
